The country’s parliamentary ethics watchdog slapped the fine as Trudeau failed to declare a gift worth more than $200 within 30 days of accepting it, according to a notice from the office of Conflict of Interest and Ethics Commissioner Mario Dion, CBC News said quotingOttawa-based website Blacklock's Reporter.

Under the Conflict Of Interest Act all public office holders must disclose within 30 days any gifts valued at $200 or more. The Prime Minister paid his$100 fine on June 18, nearly a year after skipping the deadline, according to Blacklock's Reporter, which published the report on June 22.

"As a result of an administrative error, the proper forms were not completed and the gift was not declared within 30 days," said Trudeau's press secretary Eleanore Catenaro in an email Friday.

The gift, according to the prime minister's public declaration, was two pairs of leather-covered sunglasses made by Fellow Earthlings eyewear, based in the rural P E I community of Guernsey Cove.

They were a gift from P E I Premier Wade MacLauchlan last summer and retail between $300 and $500.

The fine was first reported by the Ottawa-based website Blacklock's Reporter.

Trudeau sported the sunglasses on his trip to Vietnam in 2017. The manufacturer was thrilled.

"We just couldn't be more excited to have the most famous Canadian I can think of wearing a pair of the Fellow Earthlings Canadians," Sydney Seggie told CBC at the time.

"It's a big deal for us, for sure."

It's not the first time the prime minister has been caught on the wrong side of the Conflict of Interest Act.

Dion's predecessor, Mary Dawson, ruled last year that Trudeau violated some provisions of the act when he vacationed on a private island owned by the Aga Khan during the 2016 Christmas season and took a private helicopter to get there.

She said the vacation could reasonably be seen as an effort to influence Trudeau in his capacity as prime minister.

Dawson also fined Finance Minister Bill Morneau $200 for failing to declare a corporation that owns a villa in France.

MacLauchlan's office wouldn't comment on the fine -- but was happy to talk about the gift.

"Premier MacLauchlan was pleased to present the prime minister and [his wife] Sophie Gregoire with Island-made sunglasses last June," wrote his acting director of communications, Mary Moszynski, in an email.

"The premier is always pleased to showcase locally-made products from the Island."